Characteristics of the layered polar mesosphere summer echoes occurrence ratio observed by EISCAT VHF 224 MHz radar
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Published:2019-06-13
Issue:3
Volume:37
Page:417-427
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Author:
Ge Shucan, Li Hailong, Xu Tong, Zhu Mengyan, Wang MaoyanORCID, Meng Lin, Ullah Safi, Rauf Abdur
Abstract
Abstract. Polar mesosphere summer echoes (PMSEs) are strong radar echoes
observed in the polar mesopause during the local summer. Observations of layered
PMSEs carried out by the European Incoherent Scatter Scientific Association
very-high-frequency (EISCAT VHF) radar during 2004–2015 in the latest solar
cycle are used to study the variations of the PMSE occurrence ratio (OR).
Different seasonal behavior of PMSEs is found by analyzing the seasonal
variation of PMSE mono-, double-, and tri-layer OR. A method was used to
calculate the PMSE mono, double-, and tri-layer OR under a different electron
density threshold. In addition, a method to analyze the correlation of
the layered PMSE OR with the solar 10.7 cm flux index (F10.7) and geomagnetic K
index is proposed. Based on it, the correlation of the layered PMSE OR with
solar and geomagnetic activities is not expected to be affected by
discontinuous PMSEs. It is found that PMSE mono-, double-, and tri-layer ORs are
positively correlated with the K index. The correlation of the PMSE mono- and
double-layer OR with F10.7 is weak, whereas the PMSE tri-layer OR shows
a negative correlation with F10.7.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
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